In the same way as you estimate them for whole numbers.
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I think you round it to the nearest whole number...
The basic idea is the same as when you estimate sums and differences of larger numbers (which may or may not be integers). You round the numbers to one or two decimal digits, then add them up.
To divide decimals the partial sums method requires that numbers are separated into individual portions. The separated numbers are then solved in long division until eliminated.
you have to add
Alike is the same as Differences means subtractions Sums means additions Quotients means divisions Products means multiplications